Heating device



NOV. 22, 1932. J, H VERNET 4 1,888,400

HEATING DEVICE Filed Aug. 18, 1930 U5 f5 S 'IL-@mi fyef? La? Patented Nov. 22, 1932 PATENT OFFICE JOHN H. VERNET, OF OAK PARK, ILLINOIS HEATING DEVICE Application. led August 18, 1930. Serial No. 476,068.

This invention relates to a heating plug and particularly to a heating plug adapted for use in connection with hot water bottles. It has for one object to provide a plug which is thermostatically controlled so as to provide a heating source of constant temperature. Another object is to provide a plug of the type suggested in which the heating element projects only a short distance into the hot water bottle so that the fabric of the bottle or bag will not be brought in Contact with the heating element.

Another object is to provide in a plug of the type suggested a heating element which, while projecting into the receptacle to which the plug is applied, is held out of contact with the contents of the receptacle.

Other objects will appear from time to time in the specification and claims.

The invention is illustrated more or less diagrammatically in the accompanying drawing, in which;

Figure l is a side elevation;

Fig. 2 is a partial longitudinal view taken at line 2-2 of Fig. l; and

Fig. 3 is a transverse cross section taken at line 3 3 of Fig. 2.

Like parts are designated by like characters throughout.

A is a plug body. It may be flattened as at A1. It is provided with a threaded portion A2 from which may extend a shielding or covering element A3 of generally cylindrical shape. The member A3 is provided with one or more perforations or openings Al in its sides and may have an open end A6. Adjacent the open end A'G is an inwardly eXtending flange A7. A8 is a cavity within the body of the plug A. A9 is an air passage leading from the lower or inner end of the plug A and communicating with the cavity A8. A10 is a closure for the cavity AS. This closure is preferably provided with a perforation A11."

Fixed in the plug A is a conducting or coni 5 tact member B. It is provided with a down- 'wardly extending portion B1 which may or v may not be made integrally with it. B2 is a second conducting or contact member generally similar to the member B. It is provided with an adjustably positioned contact member B3, which is preferably threaded in it and which is adapted to contact with the thermostatic element B4 positioned within the cavity A8 upon a. plug B5, upon which it is removably held by a screw B6. A downward extension B7 runs from the plug B5 into the cavity provided within the extension A3 of the plug body A. B8 is a heating element, which in the form here shown is a coiled wirei or filament and extends from the member B1 60 to the member B7. It is of such material that it becomes highly heated when an electric current is passed through it. B9 is a shielding member which may be of metal. It lies within the extension A3, encloses the downward or inner ends of the members B1, B7 and the heating element B8 and holds these elements out of contact with the contents of a receptacle to which the plug may be applied. l v

C is a housing for the connecting members. C1 is a second part of the housing and it may be removably attached to the member C by means of a screw C2. The member C1 is provided with two cavities C3, C3, in whichy spring contact members C4 are positioned. 75 These members are adapted to contact with the members BB2 as shown in Fig. 2, and are connected in any suitable manner with conductors C5, C5. These conductors mayl be provided with insulating coatings C6, C 30 and are preferably covered together by a sheathing C7.

Although I have shown in my drawing an operative device, it will be obvious that many Y changes in form, shape and arrangement of parts may be made without departing from the spirit of my invention.

Particularly, the thermostatic feature might be omitted; the shape and design of, Y the plug might be altered; and the shape and design of the contact carrying portion of the plug might be altered.

The use and operation of this invention are as follows:

The thermostat-ic element B4 may be made 95 of any design which will cause it to move or change shape, in response to variations of temperature, so that it is effective to break the circuit preferably by moving out of con-4 tact with the point of the member B3 at a 100 VBS, thus heating it. heated, and, since it is in contact with the given temperature and thus when the temperature rises about the maximum desirable temperature, the circuit is breken automatically by this movement of the thermostatic element, and the circuit is not again made until the parts have cooled down to the desired temperature, then the circuity is again made and heating again continues. The adjustnient of the parts is preferably effected by moving the screw B3 in and out with respect to the thermostat B4. be used, it is connected with the source of current, the plug is screwed into an opening in a receptacle, for example, with a flexibley of air from the interior-of the cap B9.

The device might be further changed by having one or both of the members B1,'B7 in contact' with the cap B9,or one or both of the ends of the 'coil'BB might be in contact with Athe capv B9. Thus heat would-be conducted Vfrom the coil BS to the cap B9 directly by conductionfand not by convection.

I claim l. In a heating plug adapted for use in connection with a liquid containing receptacle as a means for heating the liquid, a plug ,housing shaped to be positioned within an opening in the receptacle, the plug including electricalconductors, said conductors extending inwardly beyond the end of the plug housing, a heating element yin circuit with said conductors, a cap surrounding said heating element and holdingit out of Contact with the liquid within the receptacle, the plug housing shape-d to surround the cap and provided with perforations whereby liquid within the container reaches the cap.

2. In a heating plug adapted for use in connection with a liquid containing receptacle as a means for heating the liquid, a plug housing shaped to be positioned with an opening in the receptacle', the plug including a pair of electrical conductors, said conductors extending inwardly beyond the end of the plug housing, a heating element in circuit with said conductors, a cap surrounding saidheating element and holding it out of contact with the vliquid within the receptacle, the plug housing shaped to surround Vthe cap and provided with perforatiens whereby liquid within the container reaches the cap.

3. Ina heating plug adapted for use in Then thedevice is to and connection with a liquid containing receptacle as a means for heating the liquid, a plug housing shaped to be positioned within an opening in the receptacle, the plug including a pair of electrical conductors, said conductors extending inwardly beyond the end of the plug housing, a heating element in circuit with said conductors, a metallic cap surrounding said heating element and holding it out of contact with the liquid within the receptacle, the plug housing shaped to surround the cap provided with perforations whereby liquid within the container reaches the cap.

4t. In a heating plug adapted for use in connection with a liquid containing receptacle as a means for heating the liquid, a plug housing shape-d to be positioned within an opening in the receptacle, the plug` including a pair of electrical conductors and a thermostatic element incircuit in one, a heatingelement in circuit with said conductors, a cap surrounding said heatingelement and holding it out of contact with the liquid within the receptacle, the plug housing shaped to surround the cap andprovided with perforations whereby reaches the cap. f

5. In a heating plug adapted for use in connection with a liquid containing receptaliquid within the container cle as a means for heating the liquid, a plug housing shaped to be positioned within an opening in the receptacle, the plug including a pair of electrical conductors and a thermostatic element in circuit in one, said conductors extending inwardly beyond the end of the-plug housing, a heating element in circuit with said conductors, a metallic cap surrounding said heating element and holding it out of contact with'the liquid within the recept-acle, the plug housing shaped to surround the cap. and provided with perforations whereby liquid within the container reaches the cap.

-6. In a heating plug adapted for use in connection with a liquid containing receptacle as a means for heating the liquid7 a plug housing shaped to be positioned within an opening in the receptacle, the plug including electrical conductors, a heating element in circuit with said conductors, a cap surrounding said heating element holding it out of contact with the liquid within the receptacle, the capl projecting inwardly slightly from the end of the housing whereby the receptacle is prevented from coming into contact with the walls of the cap. 7. In a heating plug adapted for use in connection with a liquid containing receptacle as a ymeans for heating the liquid, a plug housing shaped to be positioned within an opening in the receptacle, the plug including a pair of electrical conductors, a cap surrounding said heating element andholding it out of contact with the liquid within the receptacle, the cap projecting inwardly slightly romthe endv of the housing whereby the receptacle is prevented from coming into contact with the Walls of the cap.

8. In a heating plug adapted for use in connection with a liquid containing receptacle as a means for heating the liquid, a plug housing shaped to be positioned Within an open -ing in the receptacle, the plug including a pair of electrical conductors, said conductors extending inwardly beyond the end of the plug housing, a heating element in circuit With said conductors, a metallic cap surrounding said heating element and holding it out of contact with the liquid Within the receptacle, the cap projecting inwardly slightly from the end of the housing whereby the receptacle is prevented from coming into contact with the walls of the cap.

Signed at Chicago, county of Cook and State of Illinois, this 13th day of August,

JOHN H. VERNET. 

